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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e51efcc2fdeeb19785e1c0a23c110d8c3e0771eee84ab8a6d15c3b7b4f6a5f7d' 
  AND token = '9nznm9PqhBARSwERv9CWdvECJ5+E9Wm8u+BW54HE6f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}